dhcp(v6): T4333: migrate to new vyos_defined Jinja2 test

7 files changed, 112 insertions, 112 deletions

diff --git a/data/templates/dhcp-client/daemon-options.tmpl b/data/templates/dhcp-client/daemon-options.tmpl
index 40629dca1..5b3bff73f 100644
--- a/data/templates/dhcp-client/daemon-options.tmpl
+++ b/data/templates/dhcp-client/daemon-options.tmpl
@@ -1,4 +1,4 @@
 ### Autogenerated by interface.py ###
 
-DHCLIENT_OPTS="-nw -cf /var/lib/dhcp/dhclient_{{ifname}}.conf -pf /var/lib/dhcp/dhclient_{{ifname}}.pid -lf /var/lib/dhcp/dhclient_{{ifname}}.leases{{" -e IF_METRIC=" ~ dhcp_options.default_route_distance if dhcp_options.default_route_distance is defined and dhcp_options.default_route_distance is not none}} {{ifname}}"
+DHCLIENT_OPTS="-nw -cf /var/lib/dhcp/dhclient_{{ ifname }}.conf -pf /var/lib/dhcp/dhclient_{{ ifname }}.pid -lf /var/lib/dhcp/dhclient_{{ ifname }}.leases{{" -e IF_METRIC=" ~ dhcp_options.default_route_distance if dhcp_options.default_route_distance is vyos_defined }} {{ ifname }}"
 
diff --git a/data/templates/dhcp-client/ipv4.tmpl b/data/templates/dhcp-client/ipv4.tmpl
index b3e74c22b..83fb93dc1 100644
--- a/data/templates/dhcp-client/ipv4.tmpl
+++ b/data/templates/dhcp-client/ipv4.tmpl
@@ -7,7 +7,7 @@ initial-interval 2;
 
 interface "{{ ifname }}" {
     send host-name "{{ dhcp_options.host_name }}";
-{% if dhcp_options.client_id is defined and dhcp_options.client_id is not none %}
+{% if dhcp_options.client_id is vyos_defined %}
 {%   set client_id = dhcp_options.client_id %}
 {#   Use HEX representation of client-id as it is send in MAC-address style using hex characters. If not HEX, use double quotes ASCII format #}
 {%   if not dhcp_options.client_id.split(':') | length >= 5 %}
@@ -15,18 +15,18 @@ interface "{{ ifname }}" {
 {%   endif %}
     send dhcp-client-identifier {{ client_id  }};
 {% endif %}
-{% if dhcp_options.vendor_class_id is defined and dhcp_options.vendor_class_id is not none %}
+{% if dhcp_options.vendor_class_id is vyos_defined %}
     send vendor-class-identifier "{{ dhcp_options.vendor_class_id }}";
 {% endif %}
     # The request statement causes the client to request that any server responding to the
     # client send the client its values for the specified options.
-    request subnet-mask, broadcast-address,{{ " routers," if dhcp_options.no_default_route is not defined }} domain-name-servers,
+    request subnet-mask, broadcast-address,{{ " routers," if dhcp_options.no_default_route is not vyos_defined }} domain-name-servers,
         rfc3442-classless-static-routes, domain-name, interface-mtu;
 
     # The require statement lists options that must be sent in order for an offer to be
     # accepted. Offers that do not contain all the listed options will be ignored!
     require subnet-mask;
-{% if dhcp_options.reject is defined and dhcp_options.reject is not none %}
+{% if dhcp_options.reject is vyos_defined %}
     # Block addresses coming from theses dhcp servers if configured.
     reject {{ dhcp_options.reject | join(', ') }};
 {% endif %}
diff --git a/data/templates/dhcp-client/ipv6.tmpl b/data/templates/dhcp-client/ipv6.tmpl
index c292664e9..085cfe5a9 100644
--- a/data/templates/dhcp-client/ipv6.tmpl
+++ b/data/templates/dhcp-client/ipv6.tmpl
@@ -2,54 +2,54 @@
 
 # man https://www.unix.com/man-page/debian/5/dhcp6c.conf/
 interface {{ ifname }} {
-{% if dhcpv6_options is defined and dhcpv6_options.duid is defined and dhcpv6_options.duid is not none %}
+{% if dhcpv6_options.duid is vyos_defined %}
     send client-id {{ dhcpv6_options.duid }};
 {% endif %}
-{% if address is defined and 'dhcpv6' in address %}
+{% if address is vyos_defined and 'dhcpv6' in address %}
     request domain-name-servers;
     request domain-name;
-{%   if dhcpv6_options is defined and dhcpv6_options.parameters_only is defined %}
+{%   if dhcpv6_options.parameters_only is vyos_defined %}
     information-only;
 {%   endif %}
-{%   if dhcpv6_options is not defined or dhcpv6_options.temporary is not defined %}
+{%   if dhcpv6_options.temporary is not vyos_defined %}
     send ia-na 0; # non-temporary address
 {%   endif %}
-{%   if dhcpv6_options is defined and dhcpv6_options.rapid_commit is defined %}
+{%   if dhcpv6_options.rapid_commit is vyos_defined %}
     send rapid-commit; # wait for immediate reply instead of advertisements
 {%   endif %}
 {% endif %}
-{% if dhcpv6_options is defined and dhcpv6_options.pd is defined %}
+{% if dhcpv6_options.pd is vyos_defined %}
 {%   for pd in dhcpv6_options.pd %}
     send ia-pd {{ pd }}; # prefix delegation #{{ pd }}
 {%   endfor %}
 {% endif %}
 };
 
-{% if address is defined and 'dhcpv6' in address %}
-{%   if dhcpv6_options is not defined or dhcpv6_options.temporary is not defined %}
+{% if address is vyos_defined and 'dhcpv6' in address %}
+{%   if dhcpv6_options.temporary is not vyos_defined %}
 id-assoc na 0 {
     # Identity association for non temporary address
 };
 {%   endif %}
 {% endif %}
 
-{% if dhcpv6_options is defined and dhcpv6_options.pd is defined %}
-{%   for pd in dhcpv6_options.pd %}
+{% if dhcpv6_options.pd is vyos_defined %}
+{%   for pd, pd_config in dhcpv6_options.pd.items() %}
 id-assoc pd {{ pd }} {
 {#   length got a default value #}
-    prefix ::/{{ dhcpv6_options.pd[pd].length }} infinity;
-{%     set sla_len = 64 - dhcpv6_options.pd[pd].length|int %}
+    prefix ::/{{ pd_config.length }} infinity;
+{%     set sla_len = 64 - pd_config.length|int %}
 {%     set count = namespace(value=0) %}
-{%     for interface in dhcpv6_options.pd[pd].interface if dhcpv6_options.pd[pd].interface is defined %}
+{%     for interface, interface_config in pd_config.interface.items() if pd_config.interface is vyos_defined %}
     prefix-interface {{ interface }} {
         sla-len {{ sla_len }};
-{%       if dhcpv6_options.pd[pd].interface[interface].sla_id is defined and dhcpv6_options.pd[pd].interface[interface].sla_id is not none %}
-        sla-id {{ dhcpv6_options.pd[pd].interface[interface].sla_id }};
+{%       if interface_config.sla_id is vyos_defined %}
+        sla-id {{ interface_config.sla_id }};
 {%       else %}
         sla-id {{ count.value }};
 {%       endif %}
-{%       if dhcpv6_options.pd[pd].interface[interface].address is defined and dhcpv6_options.pd[pd].interface[interface].address is not none %}
-        ifid {{ dhcpv6_options.pd[pd].interface[interface].address }};
+{%       if interface_config.address is vyos_defined %}
+        ifid {{ interface_config.address }};
 {%       endif %}
     };
 {%      set count.value = count.value + 1 %}
diff --git a/data/templates/dhcp-relay/dhcrelay.conf.tmpl b/data/templates/dhcp-relay/dhcrelay.conf.tmpl
index a9d17ed9a..11710bd8e 100644
--- a/data/templates/dhcp-relay/dhcrelay.conf.tmpl
+++ b/data/templates/dhcp-relay/dhcrelay.conf.tmpl
@@ -1,6 +1,6 @@
 ### Autogenerated by dhcp_relay.py ###
 
-{% set max_size = '-A ' + relay_options.max_size if relay_options.max_size is defined and relay_options.max_size is not none %}
+{% set max_size = '-A ' ~ relay_options.max_size if relay_options.max_size is vyos_defined %}
 {# hop_count and relay_agents_packets is a default option, thus it is always present #}
 OPTIONS="-c {{ relay_options.hop_count }} -a -m {{ relay_options.relay_agents_packets }} {{ max_size }} -i {{ interface | join(' -i ') }} {{ server | join(' ') }}"
 
diff --git a/data/templates/dhcp-relay/dhcrelay6.conf.tmpl b/data/templates/dhcp-relay/dhcrelay6.conf.tmpl
index 58c216b7c..1fd5de18c 100644
--- a/data/templates/dhcp-relay/dhcrelay6.conf.tmpl
+++ b/data/templates/dhcp-relay/dhcrelay6.conf.tmpl
@@ -4,18 +4,18 @@
 {% set upstream = namespace(value='')  %}
 {% for interface, config in upstream_interface.items() %}
 {%   for address in config.address %}
-{%     set upstream.value = upstream.value + '-u ' + address + '%' + interface + ' ' %}
+{%     set upstream.value = upstream.value ~ '-u ' ~ address ~ '%' ~ interface ~ ' ' %}
 {%   endfor %}
 {% endfor %}
 {# listen_interface is mandatory so it's always present #}
 {% set listen = namespace(value='')  %}
 {% for interface, config in listen_interface.items() %}
-{%   if config.address is defined and config.address is not none %}
-{%     set listen.value = listen.value + '-l ' + config.address + '%' + interface + ' ' %}
+{%   if config.address is vyos_defined %}
+{%     set listen.value = listen.value ~ '-l ' ~ config.address ~ '%' ~ interface ~ ' ' %}
 {%   else %}
-{%     set listen.value = listen.value + '-l ' + interface + ' ' %}
+{%     set listen.value = listen.value ~ '-l ' ~ interface ~ ' ' %}
 {%   endif %}
 {% endfor %}
 
-OPTIONS="{{ listen.value }} {{ upstream.value }} -c {{ max_hop_count }} {{ '-I' if use_interface_id_option is defined }}"
+OPTIONS="{{ listen.value }} {{ upstream.value }} -c {{ max_hop_count }} {{ '-I' if use_interface_id_option is vyos_defined }}"
 
diff --git a/data/templates/dhcp-server/dhcpd.conf.tmpl b/data/templates/dhcp-server/dhcpd.conf.tmpl
index dbd864b5e..b16d82f5c 100644
--- a/data/templates/dhcp-server/dhcpd.conf.tmpl
+++ b/data/templates/dhcp-server/dhcpd.conf.tmpl
@@ -4,7 +4,7 @@
 # https://www.isc.org/wp-content/uploads/2017/08/dhcp43options.html
 #
 # log-facility local7;
-{% if hostfile_update is defined %}
+{% if hostfile_update is vyos_defined %}
 on release {
     set ClientName = pick-first-value(host-decl-name, option fqdn.hostname, option host-name);
     set ClientIp = binary-to-ascii(10, 8, ".",leased-address);
@@ -17,13 +17,13 @@ on expiry {
 }
 {% endif %}
 
-{{ 'use-host-decl-names on;' if host_decl_name is defined }}
-ddns-update-style {{ 'interim' if dynamic_dns_update is defined else 'none' }};
+{{ 'use-host-decl-names on;' if host_decl_name is vyos_defined }}
+ddns-update-style {{ 'interim' if dynamic_dns_update is vyos_defined else 'none' }};
 option rfc3442-static-route code 121 = array of integer 8;
 option windows-static-route code 249 = array of integer 8;
 option wpad-url code 252 = text;
 
-{% if global_parameters is defined and global_parameters is not none %}
+{% if global_parameters is vyos_defined %}
 # The following {{ global_parameters | length }} line(s) have been added as
 # global-parameters in the CLI and have not been validated !!!
 {%   for parameter in global_parameters %}
@@ -31,7 +31,7 @@ option wpad-url code 252 = text;
 {%   endfor %}
 
 {% endif %}
-{% if failover is defined and failover is not none %}
+{% if failover is vyos_defined %}
 # DHCP failover configuration
 failover peer "{{ failover.name }}" {
 {%   if failover.status == 'primary' %}
@@ -50,7 +50,7 @@ failover peer "{{ failover.name }}" {
     load balance max seconds 3;
 }
 {% endif %}
-{% if listen_address is defined and listen_address is not none %}
+{% if listen_address is vyos_defined %}
 
 # DHCP server serving relay subnet, we need a connector to the real world
 {%   for address in listen_address %}
@@ -60,70 +60,70 @@ subnet {{ address | network_from_ipv4 }} netmask {{ address | netmask_from_ipv4
 {% endif %}
 
 # Shared network configration(s)
-{% if shared_network_name is defined and shared_network_name is not none %}
-{%   for network, network_config in shared_network_name.items() if network_config.disable is not defined %}
+{% if shared_network_name is vyos_defined %}
+{%   for network, network_config in shared_network_name.items() if network_config.disable is not vyos_defined %}
 shared-network {{ network | replace('_','-') }} {
-{%     if network_config.authoritative is defined %}
+{%     if network_config.authoritative is vyos_defined %}
     authoritative;
 {%     endif %}
-{%     if network_config.name_server is defined and network_config.name_server is not none %}
+{%     if network_config.name_server is vyos_defined %}
     option domain-name-servers {{ network_config.name_server | join(', ') }};
 {%     endif %}
-{%     if network_config.domain_name is defined and network_config.domain_name is not none %}
+{%     if network_config.domain_name is vyos_defined %}
     option domain-name "{{ network_config.domain_name }}";
 {%     endif %}
-{%     if network_config.domain_search is defined and network_config.domain_search is not none %}
+{%     if network_config.domain_search is vyos_defined %}
     option domain-search "{{ network_config.domain_search | join('", "') }}";
 {%     endif %}
-{%     if network_config.ntp_server is defined and network_config.ntp_server is not none %}
+{%     if network_config.ntp_server is vyos_defined %}
     option ntp-servers {{ network_config.ntp_server | join(', ') }};
 {%     endif %}
-{%     if network_config.ping_check is defined %}
+{%     if network_config.ping_check is vyos_defined %}
     ping-check true;
 {%     endif %}
-{%     if network_config.shared_network_parameters is defined and network_config.shared_network_parameters is not none %}
+{%     if network_config.shared_network_parameters is vyos_defined %}
     # The following {{ network_config.shared_network_parameters | length }} line(s)
     # were added as shared-network-parameters in the CLI and have not been validated
 {%       for parameter in network_config.shared_network_parameters %}
     {{ parameter }}
 {%       endfor %}
 {%     endif %}
-{%     if network_config.subnet is defined and network_config.subnet is not none %}
+{%     if network_config.subnet is vyos_defined %}
 {%       for subnet, subnet_config in network_config.subnet.items() %}
-{%         if subnet_config.description is defined and subnet_config.description is not none %}
+{%         if subnet_config.description is vyos_defined %}
     # {{ subnet_config.description }}
 {%         endif %}
     subnet {{ subnet | address_from_cidr }} netmask {{ subnet | netmask_from_cidr }} {
-{%         if subnet_config.name_server is defined and subnet_config.name_server is not none %}
+{%         if subnet_config.name_server is vyos_defined %}
         option domain-name-servers {{ subnet_config.name_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.domain_name is defined and subnet_config.domain_name is not none %}
+{%         if subnet_config.domain_name is vyos_defined %}
         option domain-name "{{ subnet_config.domain_name }}";
 {%         endif %}
-{%         if subnet_config.domain_search is defined and subnet_config.domain_search is not none %}
+{%         if subnet_config.domain_search is vyos_defined %}
         option domain-search "{{ subnet_config.domain_search | join('", "') }}";
 {%         endif %}
-{%         if subnet_config.ntp_server is defined and subnet_config.ntp_server is not none %}
+{%         if subnet_config.ntp_server is vyos_defined %}
         option ntp-servers {{ subnet_config.ntp_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.pop_server is defined and subnet_config.pop_server is not none %}
+{%         if subnet_config.pop_server is vyos_defined %}
         option pop-server {{ subnet_config.pop_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.smtp_server is defined and subnet_config.smtp_server is not none %}
+{%         if subnet_config.smtp_server is vyos_defined %}
         option smtp-server {{ subnet_config.smtp_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.time_server is defined and subnet_config.time_server is not none %}
+{%         if subnet_config.time_server is vyos_defined %}
         option time-servers {{ subnet_config.time_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.wins_server is defined and subnet_config.wins_server is not none %}
+{%         if subnet_config.wins_server is vyos_defined %}
         option netbios-name-servers {{ subnet_config.wins_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.static_route is defined and subnet_config.static_route is not none %}
+{%         if subnet_config.static_route is vyos_defined %}
 {%           set static_default_route = '' %}
-{%           if subnet_config.default_router and subnet_config.default_router is not none %}
-{%             set static_default_route = ', ' + '0.0.0.0/0' | isc_static_route(subnet_config.default_router) %}
+{%           if subnet_config.default_router is vyos_defined %}
+{%             set static_default_route = ', ' ~ '0.0.0.0/0' | isc_static_route(subnet_config.default_router) %}
 {%           endif %}
-{%           if subnet_config.static_route is defined and subnet_config.static_route is not none %}
+{%           if subnet_config.static_route is vyos_defined %}
 {%           set rfc3442_routes = [] %}
 {%           for route, route_options in subnet_config.static_route.items() %}
 {%             set rfc3442_routes = rfc3442_routes.append(route | isc_static_route(route_options.next_hop)) %}
@@ -132,56 +132,56 @@ shared-network {{ network | replace('_','-') }} {
         option windows-static-route {{ rfc3442_routes | join(', ') }};
 {%           endif %}
 {%         endif %}
-{%         if subnet_config.ip_forwarding is defined %}
+{%         if subnet_config.ip_forwarding is vyos_defined %}
         option ip-forwarding true;
 {%         endif %}
-{%         if subnet_config.default_router and subnet_config.default_router is not none %}
+{%         if subnet_config.default_router is vyos_defined %}
         option routers {{ subnet_config.default_router }};
 {%         endif %}
-{%         if subnet_config.server_identifier is defined and subnet_config.server_identifier is not none %}
+{%         if subnet_config.server_identifier is vyos_defined %}
         option dhcp-server-identifier {{ subnet_config.server_identifier }};
 {%         endif %}
-{%         if subnet_config.subnet_parameters is defined and subnet_config.subnet_parameters is not none %}
+{%         if subnet_config.subnet_parameters is vyos_defined %}
         # The following {{ subnet_config.subnet_parameters | length }} line(s) were added as
         # subnet-parameters in the CLI and have not been validated!!!
 {%           for parameter in subnet_config.subnet_parameters %}
         {{ parameter }}
 {%           endfor %}
 {%         endif %}
-{%         if subnet_config.tftp_server_name is defined and subnet_config.tftp_server_name is not none %}
+{%         if subnet_config.tftp_server_name is vyos_defined %}
         option tftp-server-name "{{ subnet_config.tftp_server_name }}";
 {%         endif %}
-{%         if subnet_config.bootfile_name is defined and subnet_config.bootfile_name is not none %}
+{%         if subnet_config.bootfile_name is vyos_defined %}
         option bootfile-name "{{ subnet_config.bootfile_name }}";
         filename "{{ subnet_config.bootfile_name }}";
 {%         endif %}
-{%         if subnet_config.bootfile_server is defined and subnet_config.bootfile_server is not none %}
+{%         if subnet_config.bootfile_server is vyos_defined %}
         next-server {{ subnet_config.bootfile_server }};
 {%         endif %}
-{%         if subnet_config.time_offset is defined and subnet_config.time_offset is not none %}
+{%         if subnet_config.time_offset is vyos_defined %}
         option time-offset {{ subnet_config.time_offset }};
 {%         endif %}
-{%         if subnet_config.wpad_url is defined and subnet_config.wpad_url is not none %}
+{%         if subnet_config.wpad_url is vyos_defined %}
         option wpad-url "{{ subnet_config.wpad_url }}";
 {%         endif %}
-{%         if subnet_config.client_prefix_length is defined and subnet_config.client_prefix_length is not none %}
+{%         if subnet_config.client_prefix_length is vyos_defined %}
         option subnet-mask {{ ('0.0.0.0/' ~ subnet_config.client_prefix_length) | netmask_from_cidr }};
 {%         endif %}
-{%         if subnet_config.lease is defined and subnet_config.lease is not none %}
+{%         if subnet_config.lease is vyos_defined %}
         default-lease-time {{ subnet_config.lease }};
         max-lease-time {{ subnet_config.lease }};
 {%         endif %}
-{%         if network_config.ping_check is not defined and subnet_config.ping_check is defined %}
+{%         if network_config.ping_check is not vyos_defined and subnet_config.ping_check is vyos_defined %}
         ping-check true;
 {%         endif %}
-{%         if subnet_config.static_mapping is defined and subnet_config.static_mapping is not none %}
-{%           for host, host_config in subnet_config.static_mapping.items() if host_config.disable is not defined %}
-        host {{ host | replace('_','-') if host_decl_name is defined else network | replace('_','-') + '_' + host | replace('_','-') }} {
-{%             if host_config.ip_address is defined and host_config.ip_address is not none %}
+{%         if subnet_config.static_mapping is vyos_defined %}
+{%           for host, host_config in subnet_config.static_mapping.items() if host_config.disable is not vyos_defined %}
+        host {{ host | replace('_','-') if host_decl_name is vyos_defined else network | replace('_','-') ~ '_' ~ host | replace('_','-') }} {
+{%             if host_config.ip_address is vyos_defined %}
             fixed-address {{ host_config.ip_address }};
 {%             endif %}
             hardware ethernet {{ host_config.mac_address }};
-{%             if host_config.static_mapping_parameters is defined and host_config.static_mapping_parameters is not none %}
+{%             if host_config.static_mapping_parameters is vyos_defined %}
             # The following {{ host_config.static_mapping_parameters | length }} line(s) were added
             # as static-mapping-parameters in the CLI and have not been validated
 {%               for parameter in host_config.static_mapping_parameters %}
@@ -191,20 +191,20 @@ shared-network {{ network | replace('_','-') }} {
         }
 {%           endfor %}
 {%         endif %}
-{%         if subnet_config.range is defined and subnet_config.range is not none %}
+{%         if subnet_config.range is vyos_defined %}
 {#           pool configuration can only be used if there follows a range option #}
         pool {
 {%         endif %}
-{%         if subnet_config.enable_failover is defined %}
+{%         if subnet_config.enable_failover is vyos_defined %}
             failover peer "{{ failover.name }}";
             deny dynamic bootp clients;
 {%         endif %}
-{%           if subnet_config.range is defined and subnet_config.range is not none %}
+{%           if subnet_config.range is vyos_defined %}
 {%             for range, range_options in subnet_config.range.items() %}
             range {{ range_options.start }} {{ range_options.stop }};
 {%             endfor %}
 {%           endif %}
-{%         if subnet_config.range is defined and subnet_config.range is not none %}
+{%         if subnet_config.range is vyos_defined %}
 {#           pool configuration can only be used if there follows a range option #}
         }
 {%         endif %}
@@ -213,7 +213,7 @@ shared-network {{ network | replace('_','-') }} {
 {%     endif %}
     on commit {
         set shared-networkname = "{{ network | replace('_','-') }}";
-{%     if hostfile_update is defined %}
+{%     if hostfile_update is vyos_defined %}
         set ClientIp = binary-to-ascii(10, 8, ".", leased-address);
         set ClientMac = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
         set ClientName = pick-first-value(host-decl-name, option fqdn.hostname, option host-name, "empty_hostname");
diff --git a/data/templates/dhcp-server/dhcpdv6.conf.tmpl b/data/templates/dhcp-server/dhcpdv6.conf.tmpl
index 45d629928..c6a4f4c92 100644
--- a/data/templates/dhcp-server/dhcpdv6.conf.tmpl
+++ b/data/templates/dhcp-server/dhcpdv6.conf.tmpl
@@ -4,74 +4,74 @@
 # https://www.isc.org/wp-content/uploads/2017/08/dhcp43options.html
 
 log-facility local7;
-{% if preference is defined and preference is not none %}
+{% if preference is vyos_defined %}
 option dhcp6.preference {{ preference }};
 {% endif %}
 
-{% if global_parameters is defined and global_parameters.name_server is defined and global_parameters.name_server is not none %}
+{% if global_parameters.name_server is vyos_defined %}
 option dhcp6.name-servers {{ global_parameters.name_server | join(', ') }};
 {% endif %}
 
 # Shared network configration(s)
-{% if shared_network_name is defined and shared_network_name is not none %}
-{%   for network, network_config in shared_network_name.items() if network_config.disable is not defined %}
+{% if shared_network_name is vyos_defined %}
+{%   for network, network_config in shared_network_name.items() if network_config.disable is not vyos_defined %}
 shared-network {{ network | replace('_','-') }} {
-{%     if network_config.common_options is defined and network_config.common_options is not none %}
-{%       if network_config.common_options.info_refresh_time is defined and network_config.common_options.info_refresh_time is not none %}
+{%     if network_config.common_options is vyos_defined %}
+{%       if network_config.common_options.info_refresh_time is vyos_defined %}
     option dhcp6.info-refresh-time {{ network_config.common_options.info_refresh_time }};
 {%       endif %}
-{%       if network_config.common_options.domain_search is defined and network_config.common_options.domain_search is not none %}
+{%       if network_config.common_options.domain_search is vyos_defined %}
     option dhcp6.domain-search "{{ network_config.common_options.domain_search | join('", "') }}";
 {%       endif %}
-{%       if network_config.common_options.name_server is defined and network_config.common_options.name_server is not none %}
+{%       if network_config.common_options.name_server is vyos_defined %}
     option dhcp6.name-servers {{ network_config.common_options.name_server | join(', ') }};
 {%       endif %}
 {%     endif %}
-{%     if network_config.subnet is defined and network_config.subnet is not none %}
+{%     if network_config.subnet is vyos_defined %}
 {%       for subnet, subnet_config in network_config.subnet.items() %}
     subnet6 {{ subnet }} {
-{%         if subnet_config.address_range is defined and subnet_config.address_range is not none %}
-{%           if subnet_config.address_range.prefix is defined and subnet_config.address_range.prefix is not none %}
+{%         if subnet_config.address_range is vyos_defined %}
+{%           if subnet_config.address_range.prefix is vyos_defined %}
 {%             for prefix, prefix_config in subnet_config.address_range.prefix.items() %}
-        range6 {{ prefix }} {{ "temporary" if prefix_config.temporary is defined }};
+        range6 {{ prefix }} {{ "temporary" if prefix_config.temporary is vyos_defined }};
 {%             endfor %}
 {%           endif %}
-{%           if subnet_config.address_range.start is defined and subnet_config.address_range.start is not none %}
+{%           if subnet_config.address_range.start is vyos_defined %}
 {%             for address, address_config in subnet_config.address_range.start.items() %}
         range6 {{ address }} {{ address_config.stop }};
 {%             endfor %}
 {%           endif %}
 {%         endif %}
-{%         if subnet_config.domain_search is defined and subnet_config.domain_search is not none %}
+{%         if subnet_config.domain_search is vyos_defined %}
         option dhcp6.domain-search "{{ subnet_config.domain_search | join('", "') }}";
 {%         endif %}
-{%         if subnet_config.lease_time is defined and subnet_config.lease_time is not none %}
-{%           if subnet_config.lease_time.default is defined and subnet_config.lease_time.default is not none %}
+{%         if subnet_config.lease_time is vyos_defined %}
+{%           if subnet_config.lease_time.default is vyos_defined %}
         default-lease-time {{ subnet_config.lease_time.default }};
 {%           endif %}
-{%           if subnet_config.lease_time.maximum is defined and subnet_config.lease_time.maximum is not none %}
+{%           if subnet_config.lease_time.maximum is vyos_defined %}
         max-lease-time {{ subnet_config.lease_time.maximum }};
 {%           endif %}
-{%           if subnet_config.lease_time.minimum is defined and subnet_config.lease_time.minimum is not none %}
+{%           if subnet_config.lease_time.minimum is vyos_defined %}
         min-lease-time {{ subnet_config.lease_time.minimum }};
 {%           endif %}
 {%         endif %}
-{%         if subnet_config.name_server is defined and subnet_config.name_server is not none %}
+{%         if subnet_config.name_server is vyos_defined %}
         option dhcp6.name-servers {{ subnet_config.name_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.nis_domain is defined and subnet_config.nis_domain is not none %}
+{%         if subnet_config.nis_domain is vyos_defined %}
         option dhcp6.nis-domain-name "{{ subnet_config.nis_domain }}";
 {%         endif %}
-{%         if subnet_config.nis_server is defined and subnet_config.nis_server is not none %}
+{%         if subnet_config.nis_server is vyos_defined %}
         option dhcp6.nis-servers {{ subnet_config.nis_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.nisplus_domain is defined and subnet_config.nisplus_domain is not none %}
+{%         if subnet_config.nisplus_domain is vyos_defined %}
         option dhcp6.nisp-domain-name "{{ subnet_config.nisplus_domain }}";
 {%         endif %}
-{%         if subnet_config.nisplus_server is defined and subnet_config.nisplus_server is not none %}
+{%         if subnet_config.nisplus_server is vyos_defined %}
         option dhcp6.nisp-servers {{ subnet_config.nisplus_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.sip_server is defined and subnet_config.sip_server is not none %}
+{%         if subnet_config.sip_server is vyos_defined %}
 {%           set server_ip = [] %}
 {%           set server_fqdn = [] %}
 {%           for address in subnet_config.sip_server %}
@@ -81,33 +81,33 @@ shared-network {{ network | replace('_','-') }} {
 {%               set server_fqdn = server_fqdn.append(address) %}
 {%             endif %}
 {%           endfor %}
-{%           if server_ip is defined and server_ip | length > 0 %}
+{%           if server_ip is vyos_defined and server_ip | length > 0 %}
         option dhcp6.sip-servers-addresses {{ server_ip | join(', ') }};
 {%           endif %}
-{%           if server_fqdn is defined and server_fqdn | length > 0 %}
+{%           if server_fqdn is vyos_defined and server_fqdn | length > 0 %}
         option dhcp6.sip-servers-names "{{ server_fqdn | join('", "') }}";
 {%           endif %}
 {%         endif %}
-{%         if subnet_config.sntp_server is defined and subnet_config.sntp_server is not none %}
+{%         if subnet_config.sntp_server is vyos_defined %}
         option dhcp6.sntp-servers {{ subnet_config.sntp_server | join(', ') }};
 {%         endif %}
-{%         if subnet_config.prefix_delegation is defined and subnet_config.prefix_delegation.start is defined and subnet_config.prefix_delegation.start is not none %}
+{%         if subnet_config.prefix_delegation.start is vyos_defined %}
 {%           for prefix, prefix_config in subnet_config.prefix_delegation.start.items() %}
         prefix6 {{ prefix }} {{ prefix_config.stop }} /{{ prefix_config.prefix_length }};
 {%           endfor %}
 {%         endif %}
-{%         if subnet_config.static_mapping is defined and subnet_config.static_mapping is not none %}
+{%         if subnet_config.static_mapping is vyos_defined %}
 
         # begin configuration of static client mappings
-{%           for host, host_config in subnet_config.static_mapping.items() if host_config.disable is not defined %}
+{%           for host, host_config in subnet_config.static_mapping.items() if host_config.disable is not vyos_defined %}
         host {{ network | replace('_','-') }}_{{ host | replace('_','-') }} {
-{%             if host_config.identifier is defined and host_config.identifier is not none %}
+{%             if host_config.identifier is vyos_defined %}
             host-identifier option dhcp6.client-id {{ host_config.identifier }};
 {%             endif %}
-{%             if host_config.ipv6_address is defined and host_config.ipv6_address is not none %}
+{%             if host_config.ipv6_address is vyos_defined %}
             fixed-address6 {{ host_config.ipv6_address }};
 {%             endif %}
-{%             if host_config.ipv6_prefix is defined and host_config.ipv6_prefix is not none %}
+{%             if host_config.ipv6_prefix is vyos_defined %}
             fixed-prefix6 {{ host_config.ipv6_prefix }};
 {%             endif %}
         }